I think Iblis at the time was just interested in destroying the Cylon race, and then he could move on to humanity afterwards. "One race at a time" as it were.
If I were writing a full backstory on how Iblis did this, I would see him as someone who took the form of a living Cylon and gave them the technological breakthrough to develop the centurion robot (perhaps the old Cylon race was in a war where they needed such technology to win, or perhaps even in a civil war with each other and Iblis helped one side), knowing that inevitably the robots would destroy the living Cylons.
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